The twelfth series of the British television drama series Grange Hill began broadcasting on 3 January 1989, before ending on 10 March 1989 on BBC One.
The series follows the lives of the staff and pupils of the eponymous school, an inner-city London comprehensive school.
It consists of twenty episodes.
As of 2022, The twelfth series of Grange Hill has not been released on DVD In December 2022 ITV announced that the twelfth series of Grange Hill will be available on its streaming platform ITVx as part of its BritBox content in January 2023